Debugging multiple tasks, using a single instance of a debugger application intended to be only capable of debugging a single task, is performed by intercepting system calls made by the debugger application to the operating system. 1% to 2% of an alkali metal disposed on the surface of said catalyst, to produce a product mixture comprising 2,3,3,3-tetrafluoropropene and hydrogen fluoride; and recovering said 2,3,3,3-tetrafluoropropene from the product mixture produced in. As pulsation of noise generated during an operation of sucking refrigerant gas pass along different travel paths defined by the helicoil member, a mutual interference occurs between the pulsation respectively emerging from the travel paths of the helicoil member. Out-diffusion from the underlying active regions produces dopant densities within the epitaxial layer one, or more, orders of magnitude lower than dopant densities within the underlying active regions. The insulator includes multiple opening portions serving as flow paths of the gas. The method also includes exposing the substrate to nitrous oxide at a temperature less than about 900 C.